# Relationship history for MSHA mine 3400563

Current hierarchy: **Philip J  Schwarz Et At; Gene J  Schwarz → Schwarz Ready Mix Of Okc Inc → Schwarz Ready Mix Of Okc**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Lansan Company → Schwarz Ready Mix Of Okc; 1950-01-01 to 1979-06-11; source msha-controller-operator-history
- **controller_controls_mine:** Pritner Earl J & John L → Schwarz Ready Mix Of Okc; 1950-01-01 to 1979-06-11; source msha-controller-operator-history
- **controller_controls_operator:** Pritner Earl J & John L → Lansan Company; 1950-01-01 to 1979-06-11; source msha-controller-operator-history
- **operator_operates_mine:** C E Wells & Son Sand Company → Schwarz Ready Mix Of Okc; 1979-06-12 to 1983-02-02; source msha-controller-operator-history
- **controller_controls_mine:** Wells C E & Robert E → Schwarz Ready Mix Of Okc; 1979-06-12 to 1983-02-02; source msha-controller-operator-history
- **controller_controls_operator:** Wells C E & Robert E → C E Wells & Son Sand Company; 1979-06-12 to 1983-02-02; source msha-controller-operator-history
- **operator_operates_mine:** Schwarz Ready Mix Of Okc Inc → Schwarz Ready Mix Of Okc; 1983-02-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Philip J  Schwarz Et At → Schwarz Ready Mix Of Okc; 1983-02-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Philip J  Schwarz Et At → Schwarz Ready Mix Of Okc Inc; 1983-02-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gene J  Schwarz Et Al → Schwarz Ready Mix Of Okc Inc; 1983-02-03 to current/open; source msha-controller-operator-history